Accumulation of biopolymers in activated sludge biomass |
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Authors: | Hong Chua Peter H F Yu Chee K Ma |
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Institution: | (1) Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Kowloon, Hung Hom, Hong Kong, China;(2) Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Kowloon, Hung Hom, Hong Kong, China |
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Abstract: | In this study, activated sludge bacteria from a conventional wastewater treatment process were induced to accumulate polyhydroxyalkanoates
(PHAs) under different carbon-nitrogen (C:N) ratios. As the C:N ratio increased from 20 to 140, specific polymer yield increased
to a maximum of 0.38 g of polymer/g of dry cell mass while specific growth yield decreased. The highest overall polymer production
yield of 0.11 g of polymer/g of carbonaceous substrate consumed was achieved using a C:N ratio of 100. Moreover, the composition
of polymer accumulated was dependent on the valeric acid content in the feed. Copolymer poly (3-hydroxybutyrate-co-3-hydroxyvalerate)
P(3HB-co-3HV)] was produced in the presence of valeric acid. The 3-hydroxyvalerate (3HV) mole fraction in the copolymer was
linearly related tovaleric content in the feed, which reached a maximum of 54% when valeric acid was used as sole carbon source.
When the 3HV U in the polymer increased from 0–54 mol%, the melting temperature decreased from 178° to 99°C. Thus, the composition,
and hence the mechanical properties, of the copolymer produced from activated sludge can be controlled by adjusting the mole
fraction of valeric acid in the feed medium. |
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Keywords: | Activated sludge carbon-nitrogen ratio wastewater treatment butyric-valeric acid ratio poly(3-hydroxybutyrate-co-3-hydroxyvalerate) |
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